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Old 28-02-2024, 10:37   #1
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Connect a solar panel directly to water heater

Would it be safe to connect a 200w panel directly to a 10.5 gallon water heater with a 300w dc element?
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Old 28-02-2024, 12:07   #2
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Re: Connect a solar panel directly to water heater

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Originally Posted by CapnCrunch View Post
Would it be safe to connect a 200w panel directly to a 10.5 gallon water heater with a 300w dc element?
Safe enough, but not going to make the water very hot very fast.

A back of the envelope calculation says a full sun day will raise the temperature of the water less than 37F, assuming it is perfectly insulated and loses no heat anywhere. It will be a water “warmer”. Not a water heater.
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Old 28-02-2024, 12:51   #3
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Re: Connect a solar panel directly to water heater

Might be better to use evacuated tubes to heat the water rather than solar.

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Old 28-02-2024, 14:15   #4
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Re: Connect a solar panel directly to water heater

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Originally Posted by CapnCrunch View Post
Would it be safe to connect a 200w panel directly to a 10.5 gallon water heater with a 300w dc element?

Here is a post I made a while ago with some relevant calculations. Even though you have a DC heating element, the principle is the same:
https://www.cruisersforum.com/forums...ml#post2323284
Also, we heat water at around 170 W and it is no problem to get the water hot, it just takes several hours.
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