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diy solar

fuse help

J

Johneb

Solar Enthusiast
Joined
Dec 25, 2021
Messages
465
I am putting 4 mini 100ah batteries is 4s to power an EVO 4248 inverter. I already have a 200amp class T fuse on the inverter. From what I have read this may be to big? Also for the battery itself should I use another Class t and what size? Charging for each battery is 10amps. With 4 together would it be okay to double this? or higher?
for Charging parameters I am getting
Boost/bulk/equalizing charging 57.6
float 54.4
equalize 15 min
boost duration 30 min
overvoltage disconnect 64v
boost reconnect 52.8

What do you think?
 
You only need the class T for the battery. Fuse protects the wire. AWG of 1/0 (AWG 1 is marginal) or larger can carry 200 amps in chassis wiring. If you wiring is smaller, then you need a smaller class t fuse.
 
Stringing 12v batteries in series you should look into an active equalizer to keep them balanced. Otherwise they will drift apart because the internal resistances are not identical.
 
Johneb said:
Charging for each battery is 10amps. With 4 together would it be okay to double this? or higher?
Click to expand...
If a single battery charging limit is 10 amps, then with a series setup it's still 10 amps, that's the current through each battery.
10 amps seems low for a 100Ah battery, is this the BMS limit, or a recomendation?

Charging voltage may be too high for new batteries, suggest 56.8 or 56.0 if you get BMS over volt protection in one of the batteries.
Float 54.0 if you have loads active during the float stage, else 53.6.

Charge each with a 12v charger before connecting in series. A battery ballancer will prevent out of balance,
www.ebay.com

HA02 4S Battery Equalizer Balancer 48V Solar System Protection Battery Balancer | eBay

<li> Featureï¼</li> <li>PROTECTION: The Battery Balancer can compensate for the battery in both directions.Reverse polarity protection, low voltage disconnect to provide longer battery life time.</li> <li>CONNECT TO BATTERY: Solar Battery Balancer Can be connected in series for a long time in...
www.ebay.com

Regarding the feed fuse for the inverter, its input circuits are most likely designed for around 100 amps for the nominal 4800 watts output. The cable should be selected for this,

Part 1: Choosing the Correct Wire Size for a DC Circuit - Blue Sea Systems

Engineering high quality marine electrical components for safety, reliability and performance
www.bluesea.com www.bluesea.com
Fuse,

Part 2: Select a Fuse and Fuse Holder For Your DC Product Installation - Blue Sea Systems

Engineering high quality marine electrical components for safety, reliability and performance
www.bluesea.com www.bluesea.com
 
Last edited:
Thank you all for your input. I do have the HA02 balancers. I will drop the Bulk rate to 56 Float to 54. Thanks again.
 
mikefitz said:
If a single battery charging limit is 10 amps, then with a series setup it's still 10 amps, that's the current through each battery.
10 amps seems low for a 100Ah battery, is this the BMS limit, or a recomendation?

Charging voltage may be too high for new batteries, suggest 56.8 or 56.0 if you get BMS over volt protection in one of the batteries.
Float 54.0 if you have loads active during the float stage, else 53.6.

Charge each with a 12v charger before connecting in series. A battery ballancer will prevent out of balance,
www.ebay.com

HA02 4S Battery Equalizer Balancer 48V Solar System Protection Battery Balancer | eBay

<li> Featureï¼</li> <li>PROTECTION: The Battery Balancer can compensate for the battery in both directions.Reverse polarity protection, low voltage disconnect to provide longer battery life time.</li> <li>CONNECT TO BATTERY: Solar Battery Balancer Can be connected in series for a long time in...
www.ebay.com

Regarding the feed fuse for the inverter, its input circuits are most likely designed for around 100 amps for the nominal 4800 watts output. The cable should be selected for this,

Part 1: Choosing the Correct Wire Size for a DC Circuit - Blue Sea Systems

Engineering high quality marine electrical components for safety, reliability and performance
www.bluesea.com www.bluesea.com
Fuse,

Part 2: Select a Fuse and Fuse Holder For Your DC Product Installation - Blue Sea Systems

Engineering high quality marine electrical components for safety, reliability and performance
www.bluesea.com www.bluesea.com
Click to expand...


Note on fuses - You can get most fuses from Mouser electronics cheaper than from blue sea. They use littlefuse, bussman, and Eaton as the vendor and just repackage and mark up.

For class T fuse, current connected has a heck of a deal on them currently.
 
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