12v:bank-sizing
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
12v:bank-sizing [2023/05/17 17:42] frater_secessus [charging predictability] |
12v:bank-sizing [2023/12/29 14:57] (current) frater_secessus [charging] chargig |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | DRAFT | ||
| + | |||
| ====== sizing a house battery bank ====== | ====== sizing a house battery bank ====== | ||
| Line 6: | Line 8: | ||
| - | Everything in this article assumes you have already assessed your [[electrical: | + | * Everything in this article assumes you have already assessed your [[electrical: |
| - | + | * We will think in terms of 12v systems and 100Ah batteries. | |
| - | We will assume lithium = the common LiFePO4 | + | |
| Line 19: | Line 21: | ||
| === usable capacity === | === usable capacity === | ||
| - | * lead-chemistry batteries (FLA, AGM, GEL) are typically [[electrical: | + | * lead-chemistry batteries (FLA, AGM, GEL) are typically [[electrical: |
| - | * lithium batteries are typically nominal 12.8v and discharged to 80% DoD. A 100Ah LFP battery holds 1,280Wh, of which 1,024Wh are usable (1,280Wh x 0.8). It would take **98Ah of LFP** to give us 1,000Wh usable. | + | * lithium batteries are typically nominal 12.8v and discharged to 80% DoD. A 100Ah LFP battery holds 1,280Wh, of which 1,024Wh are usable (1,280Wh x 0.8). It would take **98Ah of LFP** to give us 1,000Wh usable. |
| Line 61: | Line 63: | ||
| * AGM 0.20C (20A for every 100Ah of capacity) | * AGM 0.20C (20A for every 100Ah of capacity) | ||
| - | If we cannot meet minimums the bank should be downsized (or charging increased) | + | If we cannot meet minimums the bank should be downsized (or [[electrical: |
| Note: Lithium has no minimum charging current | Note: Lithium has no minimum charging current | ||
| Line 72: | Line 74: | ||
| * FLA 0.20C (20A for every 100Ah of capacity) | * FLA 0.20C (20A for every 100Ah of capacity) | ||
| * AGM 0.33C (33A for every 100Ah of capacity) | * AGM 0.33C (33A for every 100Ah of capacity) | ||
| + | * LFP 1.0C (100A for every 100Ah of capacity) | ||
| - | If the alternator can only safely provide 50A of charging to the house bank this would limit us to a 166Ah AGM bank (166Ah x 0.33 = 50A). | + | If the alternator can only safely provide 50A of charging to the house bank this would limit us to a 166Ah AGM bank (166Ah x 0.33 = 50A). If the alternator has excess capacity then a larger bank can accept more current. |
12v/bank-sizing.1684345351.txt.gz · Last modified: 2023/05/17 17:42 by frater_secessus
Page Tools
affilliate disclosure | the RVwiki runs on a virtual server from NetCup
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
