Sun guard 4.5 and a 100 watt panel

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just starting
just starting Registered Users Posts: 235 ✭✭✭
in Off Grid Solar & Battery Systems #1
Does any one think a 100 watt panel would be to much for this controller it has a input up to 30 v and 4.5 amps I'm in Colorado by Colorado springs at 10000'
200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
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  • Johann
    Johann Solar Expert Posts: 245 ✭✭✭
    #2
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    A 100 watt panel will put out about 5.5 amps per panel data and if you have the renogy panel then it could exceed those rated amps especially when the climate is cold.

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  • just starting
    just starting Registered Users Posts: 235 ✭✭✭
    #3
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    Its always cold here
    200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,447 admin
    #4
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    Just to be technical... Solar panel voltage "rises" when the cells get cold.

    Solar panel output current falls (slightly) then the cells get cold (in general, we ignore the effects of heat and cold regarding Isc and Imp--The change in current due to temperature is pretty small).

    For PWM (inexpensive controllers like the Sun Guard)--Do not need to "adjust" for current changes due to temperature. However, you can have increased current due to "edge of cloud" effects, and reflections from snow/water/beach sand. But, again, normally if the Imp/Isc is less than the rated current capabilities of the PWM controller--You should be fine.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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