WorldwideDave
Solar Addict
I have funds and am shopping for 48V options now.
I want Victron comms. You're welcome, Team Blue.
I am looking at both DIY and pre-built options.
What I've observed, particularly on the pre-built options, is that many have a 125 A or similar breaker.
I want to be able to discharge and charge at the most as possible. If it means paying $100 more for a BMS, and the cells will support that, I'll do it.
That got me to thinking.
I get that people want to charge as fast as possible. Just as an example, if the 16S batteries and conductors and lugs will support it, what good is it to have 28 panels and only charge at 100A when you have MPPTs cranking out 200A? Charging a lot, and fast, is important, especially for me where there is a lot of shading going on and 6 parallel strings right now (with 12 panels testing out 6 strings of 2s2p now; was doing 4 strings of 3s2p before) and about 3 marginal hours of sun a day.
For discharge, though - I thought most server rack batteries were 200A rated, but I guess that is bursts, not continuous. Most seem to be 100A that have recently been reviewed by Will (Vatrer, Eco-Worthy, SOK, etc) if my memory is correct (may have to re-watch). I'm talking a single battery, not two batteries or more in parallel.
So my math is right, please help me: with 100 A continuous at 52 V, we're talking 5200 W load, or 4800 to be safe, which means an inverter would be needed than can handle a continuous 5000 W continuous load. Am I right so far?
Continuing this thought...if I were to add an additional 48V 100Ah battery in parallel, then at least on paper/theory, assuming things are balanced and wired right and more, then the load from the two batteries would be split - 50A from one and 50A from the other. The same is true whether charging or discharging; the amps flowing would be split because there is two batteries instead of one. Am I correct?
When I see people buying 5-8 server rack batteries, I always assumed it was only to store more incase of no sun/grid days, and having enough to power their loads (like winter in some foul-weather places away from equator). But I think the other benefit is to split the current flowing as well to be able to run higher amperage loads and charging.
Is my understanding correct?
I do want to DIY a battery to save costs, but at some of those $850 price range batteries with victron comms its getting hard to justify the labor.
I want Victron comms. You're welcome, Team Blue.
I am looking at both DIY and pre-built options.
What I've observed, particularly on the pre-built options, is that many have a 125 A or similar breaker.
I want to be able to discharge and charge at the most as possible. If it means paying $100 more for a BMS, and the cells will support that, I'll do it.
That got me to thinking.
I get that people want to charge as fast as possible. Just as an example, if the 16S batteries and conductors and lugs will support it, what good is it to have 28 panels and only charge at 100A when you have MPPTs cranking out 200A? Charging a lot, and fast, is important, especially for me where there is a lot of shading going on and 6 parallel strings right now (with 12 panels testing out 6 strings of 2s2p now; was doing 4 strings of 3s2p before) and about 3 marginal hours of sun a day.
For discharge, though - I thought most server rack batteries were 200A rated, but I guess that is bursts, not continuous. Most seem to be 100A that have recently been reviewed by Will (Vatrer, Eco-Worthy, SOK, etc) if my memory is correct (may have to re-watch). I'm talking a single battery, not two batteries or more in parallel.
So my math is right, please help me: with 100 A continuous at 52 V, we're talking 5200 W load, or 4800 to be safe, which means an inverter would be needed than can handle a continuous 5000 W continuous load. Am I right so far?
Continuing this thought...if I were to add an additional 48V 100Ah battery in parallel, then at least on paper/theory, assuming things are balanced and wired right and more, then the load from the two batteries would be split - 50A from one and 50A from the other. The same is true whether charging or discharging; the amps flowing would be split because there is two batteries instead of one. Am I correct?
When I see people buying 5-8 server rack batteries, I always assumed it was only to store more incase of no sun/grid days, and having enough to power their loads (like winter in some foul-weather places away from equator). But I think the other benefit is to split the current flowing as well to be able to run higher amperage loads and charging.
Is my understanding correct?
I do want to DIY a battery to save costs, but at some of those $850 price range batteries with victron comms its getting hard to justify the labor.
