EVE 280 ah to the UK - 24v bus install

Paul UK

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Joined
Aug 21, 2021
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2
I've ordered 8x EVE 280ah from Amy Wan at Shenzhen Luyuan, out of stock at the moment but she's expecting them from the factory early December. $125*8+$257=$1257. Went with them due to their reputation on here and elsewhere and Amy lived up to that, very helpful and courteous. I don't mind paying a bit extra for the peace of mind. The server rack batteries Will likes so much don't seem to be making their way over here yet, or likely any time soon given the UK's issues.

They're going into a 24v system with Electrodacus SBMS0 + 2x DSSR and DEXT16 for thermal redirect. Don't know about the inverter yet, probably go with Victron Multiplus 24/3000 given its reputation and Dacian's recommendation.

(Vehicle is a Hino Liesse II 29 seat bus en route from Japan around the same time as the cells, but that's another story).

Will keep this updated and may start some other threads.

Cheers

P
 

sunshine_eggo

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Make sure you get 60 cell panels for 24V. If you get 72 cell, you'll lose a lot of efficiency.

Electrodacus, while awesome in many ways, is the most unsophisticated charge controller around. It simply shorts the panel to the battery. Once voltage is attained, it shuts off, or it diverts. It's even more primitive than PWM.

If you get 72 cell panels with a Vmp of ~36-40, you'll lose a lot of power when it's driven down to ~28V and lower, e.g., (38V - 28V)/38V = 26% power loss, so if you have 300W panels, they'll never produce more than 222W.

If you use 60 cell panels with a Vmp around 30-32V, you lose far less.
 

Paul UK

New Member
Joined
Aug 21, 2021
Messages
2
Make sure you get 60 cell panels for 24V. If you get 72 cell, you'll lose a lot of efficiency.

Electrodacus, while awesome in many ways, is the most unsophisticated charge controller around. It simply shorts the panel to the battery. Once voltage is attained, it shuts off, or it diverts. It's even more primitive than PWM.

If you get 72 cell panels with a Vmp of ~36-40, you'll lose a lot of power when it's driven down to ~28V and lower, e.g., (38V - 28V)/38V = 26% power loss, so if you have 300W panels, they'll never produce more than 222W.

If you use 60 cell panels with a Vmp around 30-32V, you lose far less.
Yeah it's a good point for anyone looking into a system like this, we'll be going for 2x2 well matched 120 half cut cells around 300-350w for better shaded performance
 

DJSmiley

Solar Addict
Joined
Aug 13, 2020
Messages
584
Make sure you get 60 cell panels for 24V. If you get 72 cell, you'll lose a lot of efficiency.

Electrodacus, while awesome in many ways, is the most unsophisticated charge controller around. It simply shorts the panel to the battery. Once voltage is attained, it shuts off, or it diverts. It's even more primitive than PWM.

If you get 72 cell panels with a Vmp of ~36-40, you'll lose a lot of power when it's driven down to ~28V and lower, e.g., (38V - 28V)/38V = 26% power loss, so if you have 300W panels, they'll never produce more than 222W.

If you use 60 cell panels with a Vmp around 30-32V, you lose far less.

With a MPPT that doesn't matter. A higher voltage has the benefits of having less cable losses (and require thinner wires)

The power loss you're referring to applies to PWM, but in 2021, there is no reason to go for old PWM stuff (Unless you have old / low voltage panels you want to reuse)
 

sunshine_eggo

Happy Breffast!
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Oct 26, 2021
Messages
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Location
USA
With a MPPT that doesn't matter. A higher voltage has the benefits of having less cable losses (and require thinner wires)

The power loss you're referring to applies to PWM, but in 2021, there is no reason to go for old PWM stuff (Unless you have old / low voltage panels you want to reuse)

He has explicitly stated he's using the Electrodacus DSSR/DEXT-16 for solar. These operate by shorting the panels to the battery. 60 cell panels are the best option for systems using DSSR/DEXT-16.

There isn't an MPPT or PWM in his system.
 
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