12V 200Ah Solar Battery: Build a Bank from 6-EVF-100

Answer First

There is no single 12V 200Ah cell in the CHISEN range, and a buyer who expects one will waste weeks comparing quotations that nobody can honour: the standard way to build a 12V 200Ah solar battery bank is two 12V 100Ah AGM blocks — the 6-EVF-100 — wired in parallel, which gives 12 V × 200 Ah = 2,400 Wh, weighs 2 × 31.5 kg = 63.0 kg and accepts 2 × 20.0 A = 40.0 A of charge current, while the single-unit alternatives inside the same 12V EVF range are the 6-EVF-120, 6-EVF-135 and 6-EVF-150. This guide sets out the published specification of those four cells, shows the arithmetic for the two-unit bank and the 48 V pack built on it, and gives the seven checks to run before you order from a supplier in Hangzhou, Rotterdam, Jebel Ali, Lagos or Chennai.

Key Takeaways

• CHISEN publishes no 12V 200Ah model: the 12V 200Ah solar battery bank is two 6-EVF-100 12V 100Ah AGM blocks in parallel, which is 12 V × 200 Ah = 2,400 Wh.
• The bank weighs 2 × 31.5 kg = 63.0 kg and its maximum charge current is 2 × 20.0 A = 40.0 A; specific energy is 2,400 Wh ÷ 63.0 kg = 38.1 Wh/kg.
• The published 100 Ah is a C3 rating; the 10-hour rate (C10) is not published on these pages, so a daily cycle sized on a 10-hour discharge must be quoted against a C10 figure the factory still has to supply.
• Single-unit options in the same range give 1,440 Wh at 36.0 Wh/kg (6-EVF-120), 1,620 Wh at 36.0 Wh/kg (6-EVF-135) and 1,800 Wh at 37.1 Wh/kg (6-EVF-150), against 38.1 Wh/kg for the parallel pair.
• Float 13.5 V and equalisation 14.1 V for the block — 2.25 V and 2.35 V per cell — are the setpoints to fix in writing; cycle life is published at 350–600 cycles at 50–80 % depth of discharge and design life at 2–5 years.

§1 — 12V 200Ah Solar Battery Specifications

The table below reproduces the published specification of the four 12V EVF cells that bracket the 200Ah solar duty, so the bank you specify can be defended line by line at the goods-in dock. Every cell figure comes from the manufacturer model page; derived figures are shown with their formulas.

Two rows deserve a note before they go into a purchase order. The float and equalisation figures are block values across the six cells in series, so 13.5 V is 2.25 V per cell and 14.1 V is 2.35 V per cell; a charger set to 14.4 V will shorten service life without adding usable capacity. And the rated capacity is quoted at the three-hour rate, not the rate at which a solar day discharges it.

§2 — The Pain

Three failures account for almost every 12V 200Ah solar battery complaint that reaches a distributor’s technical desk in Hamburg, Durban or Mombasa.

The first is the label. A carton marked “12V 200Ah” tells you nothing about the case, the terminals, the rate basis of the capacity or the charge setpoints. Two suppliers can both print “12V 200Ah AGM” and deliver two different banks: one built from two 100Ah blocks with a published 63.0 kg weight, the other from two lesser cells with no published weight at all. A buyer who quotes capacity alone gets a bank that does not fit the cabinet and does not match the charger.

The second is the rate basis. A bank assembled from two 100Ah blocks holds 200 Ah at the three-hour rate. A solar day is a ten-hour discharge, and the capacity available in that window is lower than the headline figure. If the bank is sized on the published C3 number and not on a C10 figure, the site runs out of energy before the array is fully used, and the owner blames the battery instead of the sizing. None of the four model pages publishes a ten-hour rate, so that figure has to be requested from the factory in writing.

The third is wiring. Two blocks in parallel must be matched: equal-length interconnecting leads, the same date code on both units, and a fuse or breaker on each string. A bank built from two units of different age will not share current evenly, and the older cell fails first. Nothing in the model page protects against that; only the assembly instruction does.

Underneath those three sits a sourcing problem. Buyers in Lagos, Chennai, Cairo and Jakarta regularly receive a quotation listing “12V 200Ah solar battery, top quality, top grade” with no datasheet reference, which makes the order impossible to compare between suppliers and impossible to re-order next season.

§3 — The Choice

Choosing the build for a 12V 200Ah solar bank is a trade between four published quantities: the footprint on the cabinet shelf, the weight a technician has to lift, the energy per kilogram, and the charger size. The table below sets the five realistic options against each other.

Read the table as four answers to four different questions. In the single-unit rows the weight, charge current and footprint are published model-page values; the energy and specific-energy columns are derived from them and shown with their formulas.

If the site genuinely needs 200 Ah at 12 V, the parallel pair of 6-EVF-100 blocks is the only build in the table that delivers it: 2,400 Wh at 63.0 kg and 38.1 Wh/kg, the best specific energy of the 12V options listed. The full cell data sits on the 6-EVF-100 model page, and the 6-EVF-150 model page carries the reference cell most distributors already hold.

If the cabinet is narrow and the load can live with 150 Ah, the single 6-EVF-150 wins on simplicity: one block instead of two, one string instead of two parallel strings, and 37.1 Wh/kg against 38.1 Wh/kg for the pair. It also carries a published cycle rating of 350–600 cycles at 50–80 % depth of discharge compliant with GB/T 32620.1 — the standard written into the model page rather than into a marketing sheet.

If the site runs at 48 V — normal for a telecom cabinet or a larger solar house — four cells in series give 48 V × 100 Ah = 4,800 Wh at 126.0 kg and require an 80.0 A charger, set by the published maximum charge current of 20.0 A per cell rather than by rule of thumb.

If the footprint rather than the weight binds, note that the two-unit bank is longer but lower: 690 mm across two housings at 218 mm high, against 483 mm long and 240 mm high for a single 6-EVF-150. On a 680 mm shelf a four-cell 48V string fits; on a 700 mm shelf the 690 mm pair fits; on a 500 mm bracket only a single block fits.

§4 — The Framework

Seven checks turn a vague enquiry into an order a factory can fill correctly.

1. Ask for the published figure set, not the label. Require capacity with its rate basis, dimensions in millimetres, weight with tolerance, terminal type, float and equalisation voltage, maximum charge current, cycle rating, cut-off voltage and working temperature. A supplier that answers all ten is not guessing; one that answers “12V 200Ah AGM” is.

2. Fix the rate basis before the capacity. Ask for the capacity at the ten-hour rate for the duty you actually have, and treat a supplier who cannot supply it as one who has not read the cell. The published C3 figures in §1 are correct; they answer a different question.

3. Write the charge setpoints into the order. 13.5 V float and 14.1 V equalisation for the block, 2.25 V and 2.35 V per cell once the arithmetic is done. Confirm the controller can be configured to both, confirm the equalisation period and confirm the temperature-compensation input if the cabinet runs hot. A 25 °C setpoint in a 45 °C cabinet is an over-charge condition.

4. Size the charger from the published charge current. The 6-EVF-100 accepts 20.0 A, so a two-block bank needs 2 × 20.0 A = 40.0 A, which is 0.2C on a 200 Ah bank. A smaller charger stretches the recharge window and leaves the bank partly discharged for longer.

5. Check the temperature envelope and the ventilation. The published working range is −15 °C to 50 °C and capacity is quoted at 25 °C. A cabinet in Chennai, Jebel Ali or Santos will not see 25 °C for most of the year; ask what capacity remains at the extremes and confirm the ventilation.

6. Specify the parallel assembly. Equal-length leads, matched date codes, one breaker per string, and the same cell in both strings of every bank. Put this on the order acknowledgement, because it is the part the factory cannot see when the container is sealed.

7. Agree the acceptance test on arrival. For shipments into Rotterdam, Jebel Ali, Lagos or Port Said, state what happens on arrival: a sample capacity check at the agreed rate, a float voltage check across the block, and the rule that a failing sample is settled by re-inspection at an agreed laboratory.

§5 — The Trust

These cells are built on a VRLA line inside a manufacturer operating 8 production bases with an annual capacity of 70 million kVAh, under ISO 9001 and ISO 14001 certification, with CE, UL and IEC conformity for the markets each cell ships into. Every figure here comes from an individual model page rather than a catalogue summary, and the wider 12V range sits on the CHISEN 12V VRLA product index.

Two points deserve emphasis for a buyer who is being asked to pay for assurance. First, a certificate covers a system, a scope and a date — ISO 9001 certifies that the quality management system is documented and that corrective action happens; it does not certify that one cell holds 100 Ah at C3. That is what the published capacity, the type test and the acceptance test are for. Ask for the certificate number, the scope statement and the validity dates.

Second, the difference between a published specification and a marketing line is the whole value of this exercise. A supplier who quotes “12V 200Ah solar battery, premium quality” is telling you nothing. A supplier who quotes “6-EVF-100 × 2 in parallel, 12 V 200 Ah at C3, 2,400 Wh, 63.0 kg, 40.0 A maximum charge current, float 13.5 V, equalisation 14.1 V” is telling you everything you need to draw the cabinet, size the charger and defend the claim at the goods-in dock.

For importers who buy through a distributor rather than direct, ask for the manufacturer’s model page URL and the batch reference. Both can be checked before the container is opened, and both remove the largest source of dispute in this category.

§6 — FAQ

Q1. Is there a 12V 200Ah battery model? No. CHISEN publishes 12V cells from 12 Ah upward in the 6-DZF and 6-DMF series and from 24 Ah upward in the 6-EVF series, and the largest published 12V cell is the 6-EVF-150 at 150 Ah. No single cell is rated 200 Ah at 12 V, so a 12V 200Ah bank has to be assembled from two 100 Ah blocks in parallel, which is what this guide sizes.

Q2. How many 12V 100Ah batteries do I need for 200Ah? Two, wired in parallel. In parallel the voltage stays at 12 V and the capacity adds: 12 V × 200 Ah = 2,400 Wh. In series the capacity stays at 100 Ah and the voltage doubles to 24 V. Parallel requires equal-length leads and matched cells; series requires matched voltage at the start of the string.

Q3. What does the bank weigh? 2 × 31.5 kg = 63.0 kg for two 6-EVF-100 blocks, plus busbars, insulators and the cabinet. A single 6-EVF-150 weighs 48.5 kg and a 6-EVF-135 weighs 45 kg, so the parallel pair is 14.5 kg heavier than one 150 Ah cell and 18.0 kg heavier than one 135 Ah cell, while carrying 50 Ah and 65 Ah more at 12 V.

Q4. What charger do I need for a 12V 200Ah bank? A 12 V charger with a 40.0 A output, because the published maximum charge current is 20.0 A per cell and 2 × 20.0 A = 40.0 A. That is 0.2C on a 200 Ah bank, and the recharge window at that current is 200 Ah ÷ 40.0 A = 5.0 hours. Set float at 13.5 V and equalisation at 14.1 V for the block.

Q5. Is the published 100 Ah usable for a solar day? The published figure is a C3 rating. On a ten-hour discharge the usable capacity is lower, and the ten-hour rate is not published on the model page. Size the array on a figure the factory supplies in writing at the ten-hour rate, or apply the derating your own engineering standard requires.

Q6. Which is better for solar standby, a 12V 200Ah AGM bank or a 48V bank of four cells? Different tools. A 12V 200Ah bank gives 2,400 Wh at 63.0 kg and needs a 40.0 A charger; a 48V bank of four 6-EVF-100 cells gives 4,800 Wh at 126.0 kg and needs an 80.0 A charger. The 48V string halves the cable current for the same power and is the normal choice above about 2 kW of load.

Q7. How long will a 12V 200Ah solar battery bank last? In float standby with solar charging, the published design life is 2–5 years and the cycle rating 350–600 cycles at 50–80 % depth of discharge. In solar duty the binding factor is usually the number of cycles the site sees, not the calendar. A site in Chennai or Jebel Ali will find the temperature envelope as decisive as the cycle count.

Q8. Can I mix a 6-EVF-100 and a 6-EVF-120 in the same bank? Technically the voltages are equal, but the capacities are not, and the 20.0 A and 24.0 A charge-current figures differ. Current in a parallel pair divides by capacity, so the smaller cell carries more than its share. Keep a bank on identical cells, or on matched strings with the same capacity and date code.

Q9. What should be on the purchase order for a 12V 200Ah solar battery bank? The cell model and quantity, the parallel arrangement, the float and equalisation voltages, the maximum charge current, the rate basis of the capacity, the cycle rating and depth of discharge, the terminal type, the date code match, the test certificate and the acceptance procedure on arrival. For Rotterdam, Santos or Mombasa, name the agreed laboratory for a failing-sample inspection.

Q10. Do I need a temperature-compensated charger? For a cabinet that regularly exceeds 30 °C, yes. The published float voltage of 13.5 V assumes 25 °C, and a fixed setpoint in a hot cabinet is an over-charge condition that shows up as shortened service life and more frequent water loss rather than as a fault report.

Expert Summary

A 12V 200Ah solar battery bank is a build, not a product code: two 6-EVF-100 12V 100Ah AGM blocks in parallel, giving 12 V × 200 Ah = 2,400 Wh at 2 × 31.5 kg = 63.0 kg, a specific energy of 2,400 Wh ÷ 63.0 kg = 38.1 Wh/kg, and a maximum charge current of 2 × 20.0 A = 40.0 A. The published specification behind that build is 12 V, 100 Ah at C3, 330 × 170 × 218 mm, 31.5 ± 0.2 kg, float 13.5 V, equalisation 14.1 V, 350–600 cycles at 50–80 % depth of discharge and 2–5 years design life; the single-unit alternatives are the 6-EVF-120, 6-EVF-135 and 6-EVF-150.

The commercial value of specifying precisely exceeds the price difference between the builds. A quotation written against published figures can be compared across three suppliers in ten minutes and defended at the goods-in dock. One written against a label cannot be compared at all, and the difference appears three months later as a warranty claim.

Two figures deserve a final emphasis for buyers working outside Europe. First, the 40.0 A charger requirement comes from the published charge current, not from marketing: if the charger is smaller, the recharge window stretches and the bank spends more of its life half-discharged, which is the condition that sulphates a plate. Second, the published capacity is a C3 figure and the ten-hour rate is not published, so any solar array sized on the headline number is sized on the wrong number until the factory supplies the rate for your duty.

For importers into markets served from Rotterdam, Jebel Ali, Santos, Lagos or Chennai, the sequence that works is simple: fix the published specification first, then let suppliers compete on it. The §1 figure set is enough to run that process.

Contact CHISEN

Send the target application, the required capacity at the discharge rate you actually have, the cabinet dimensions you need to fit and the quantity to the CHISEN export desk, and you will receive a quotation against the published specification, the datasheet and the lead time.

• Email: jack@chisen.cn or sales@chisen.cn
• WhatsApp: +86 131 6622 6999
• 6-EVF-100 model page: https://www.chisen.cn/en/6-EVF-100/12V100Ah.html
• 6-EVF-150 model page: https://www.chisen.cn/en/6-EVF-150/12V150Ah.html
• 12V VRLA product index: https://www.chisen.cn/en/LeadacidBattery/EVF.html

Related reading on the CHISEN knowledge centre: 12V VRLA selection guidance, deep-cycle charge setpoints, and pack-sizing method for solar house and telecom applications.

CHISEN Battery — lead-acid cells and systems for telecom, solar, UPS, AGV and traction applications. 8 production bases, 70 million kVAh annual capacity, ISO 9001 and ISO 14001 certified.

CHISEN Battery Team

Engineering and export team at CHISEN Battery, Hangzhou, China. Lead-acid and lithium battery manufacturer, ISO 9001 / CE / UL certified, exporting to 50+ countries.

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