BMV Battery monitor settings

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david-morgan asked Jul 23, '19

BMV Battery monitor settings

I have a battery bank of 8 no. 12volt lead acid 105a/h batteries on my boat running a 24volt system. So a total battery capacity of 840a/h. Simple question, is 840 the correct figure to input to the battery capacity setting of the BMV700? Or is it a different figure because the 12volt batteries are wired to produce 24volts?

battery capacity

2 |3000

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Answer 1 · 2019-07-23T09:06:54Z

Robert answered · Jul 23, 2019 at 09:06 AM

420Ah is the correct setting.

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2 |3000

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david-morgan commented · Jul 23, 2019 at 06:46 PM

Thanks for your answer. I will now change the setting from 840 to 420!

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Answer 2 · 2019-07-23T09:12:44Z

JohnC answered · Jul 23, 2019 at 09:12 AM

Hi David. Ah should always be quoted at a certain V. Which you did.

2x of your batts in a series string would become 105 Ah @ 24V.

4x strings of those would be 420 Ah @ 24V.

Wh of each batt adds though. For you, each batt is 12 x 105 = 1260Wh. 8x becomes 10080 Wh.

Divide that by the V you're using (24V) = 420Ah. QED. :)

Edit/: Sorry Robert, same result..

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2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

david-morgan commented · Jul 23, 2019 at 06:45 PM

Thanks for your answer. I will now change the setting from 840 to 420!

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Robert commented · Jul 23, 2019 at 09:54 PM

an answer with a full explanation is a good thing. No apology needed.

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