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Options for mppt charge controller 60v battery bank
#11
(09-15-2019, 05:31 PM)Doin it Wrote: I’d need higher voltage than this to charge a 60v lithium pack

This is still very vague. You say 60V pack, but that can't be the nominal voltage. What is your series connection? Is it a 14s, 15s, 16s????

4.2 * 14 = 58.8V
4.2 * 15 = 63.0V
4.2 * 16 = 67.2V
And this is absolute max voltage. What is your upper voltage charge per cell? ie 4.2, 4.1, 4.0V????
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#12
The pack is 16s..so I guess it’s actually more like a 64v pack but they call it 60v...65.6-67.2v is the max charge..56-59.2 is as low as the packs voltage should be.
most charge controllers charge 12,24,36,48v then some also do 60v,72v,etc in multiples of 12v...the 2 controllers in the previous pics have an option for a 60v battery.
What I need help with is trying to find a mppt charge controller that has a setting for 60v battery that hopefully isn’t from Aliexpress, besides the midnite
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#13
I tend to use 16s packs, at 4v/cell which is perfect for Victron chargers as their top limit is 64v - Victron inverter max input tends to be 66v - which is a naturally safe combination - but you are being vague about what your maximum battery voltage will be, which is obviously related to what your maximum cell voltage will be, which you can self select.
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#14
3.7 * 16 = 59.2V
So 60V would be more correct, not 64V. It is based on the "nominal" voltage, not the max voltage.
Bottom voltage of 3.2V/cell would be 51.2V

3.2 * 16 = 51.2V
3.7 * 16 = 59.2V
4.2 * 16 = 67.2V

So your working voltage range is 51.2V - 67.2V. However, charging to 4.2V will not do your cells any favors and will actually keep your cycle life down in the 100's of cycles. Just changing to 4.1V, or 65.6V, for your top end will give you close to 1000 cycles. And then dropping to 4.0V, or 64V, will give you over 1000 cycles.

Looking for a charger that can do 64V is a lot easier than finding one that can do 67V.
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#15
You cant assume what a chargers max voltage will be based on an assumption based on their advertising, or your nominal battery voltage - you need positive confirmation either direct from the manufacturer or from users.
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#16


Yeah I wasn’t going to charge to the max..that was just what the description of the battery says..So then I should not charge the battery over 65.2 and stay at more like 64v to prolong battery life which is what I thought although I didn’t know the exact voltage to charge them to.. My inverters input voltage is 50ish-90v to operate, this is why I am wanting a 60v battery pack so I was thinking since 70v is in the middle of the inverters operating voltage I would then get the best efficiency out of my inverter with a 60v pack and charging it to as high as I can and still keeping battery life in the 1000s of cycles.. really I should be using a 72v battery pack to get best output from the inverter
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#17
Buying an unknown is simply a gamble.
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#18
Yeah Sean that’s the problem...trying to keep the system cost low..I was just hoping for a 300 to max 400$ charger that is sold in the USA that could charge my lithium 60v pack properly.. tbh tho my inverters are “cheap Chinese” and seem to work great and other ppl have been using them for yrs so idk I might go with an Aliexpress cc if I can’t find a USA version that meets my needs for under 400$

I guess the victrons can be fully adjustable thru an iPad app ?
So keeping the battery between 56v and 64v is what I should do to not degrade the batteries to fast?
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#19
Looks like a rebadged eSmart3 with higher voltages. If they are, then they're not that bad of a unit. I have one myself and they're working fine. Mine's the 60A 12/24/48V version for $150 on ebay. For that money it's been a decent unit. Mine's running for a year now with nearly no issues except for the terminal blocks they used. Just make sure all the screws are tightened as mine loosen over time but it's more my fault.
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#20
I need to be looking for mppt charge controllers that charge up to atleast 64v then..and from what I’m reading some 48v charges do this?
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