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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > Echo Charger with standby battery bank
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Thread: Echo Charger with standby battery bank Reply to Thread
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Topic Review (Newest First)
06-05-2012 08:45 AM
sstuller
Re: Echo Charger with standby battery bank

It is safe to say then that the house bank would make up the amp difference between the charger's output and the Echo's demand of 15 amps until the house battery's voltage drops below 13 volts (26 volts in a 24 volt system). That's OK. I was just curious about how the Echo works. That's why it's considered a B2B charger. Thanks.
06-05-2012 08:22 AM
Maine Sail
Re: Echo Charger with standby battery bank

It can "potentially" for a short while if the bank voltages are quite unequal but that would soon come to an end as the banks voltages would get closer and closer.. With the Ech always connected and not "switched" on you will likely never see that. the solar panel at 4A max would not be able to keep the house voltage up high enough to support the Echo's potential of 15A for very long. If your Echo regularly feeds a start bank 15A it is probably the wrong device for the task.
06-05-2012 03:54 AM
sstuller
Re: Echo Charger with standby battery bank

An Echo Charger is considered a B2B charger (battery to battery). No one answered my question as to whether the Echo can draw up to 15amps from the primary bank or is limited to the output of the solar panel (4 amps). Thanks.
05-24-2012 10:26 AM
btrayfors
Re: Echo Charger with standby battery bank

OK, you have a 24V system. All my comments (and Maine Sail comments above) were predicated on a 12V system, but it shouldn't make any difference to you because the EchoCharge works with both 12V and 24V systems.

The following is from the Xantrex EchoCharge manual:

QUOTE
When the input voltage is 13.0/25.5 volts DC or higher, echo-charge
automatically switches ON. The LED glows a steady green. When the
input voltage is lower than 13.0/25.5 volts, the echo-charge automatically
switches OFF, and the LED blinks green.

The output voltage of echocharge is limited to 14.4/28.8 volts. When it reaches 14.4/28.8 volts, the charge current will decrease, maintaining a float condition. The starter battery will be fully charged without overcharging.
No load current drain on the house bank is less than 50 milli-amps.

If the input voltage is above 14.4 volts (or 28.8), output will be limited to a
maximum of 14.4/28.8 volts.
UNQUOTE

Bill
05-24-2012 05:56 AM
Maine Sail
Re: Echo Charger with standby battery bank

If your controllers float can keep the battery voltage above 13v, which is what a "float" feature will do, the the Echo will work just fine..
05-24-2012 03:50 AM
sstuller
Re: Echo Charger with standby battery bank

It is a 24 volt 100 AH system for a Torqeedo 801. There is a 24 volt 130 watt solar panel (35 vmp) for charging. The 100 AH battery capacity is plenty for daysailing. For cruising I would like to add extra battery capacity for the occasional long day but don't need the extra weight for daysailing. Thanks.
05-23-2012 07:10 PM
btrayfors
Re: Echo Charger with standby battery bank

Let's not make this more complicated than it is.

If there's a charging voltage on the main battery -- and a float voltage of 13.2-13.6VDC qualifies as a charging voltage -- then the EchoCharge will pass thru some current to the auxiliary battery.

If the main battery voltage falls below about 13VDC, as it would if all charging sources were removed, then the EchoCharge will cut off.

A solar panel has plenty of potential to keep the voltage above 13VDC, so long as there is light. When there is no light or very low light and the voltage falls below 13.0, then the EchoCharge will cut off.

Whether or not this is sufficient to your needs would depend on your setup...type/size of batteries, size of solar panel, type of controller, other charging sources, how you use the boat, etc.

BTW, your original post said 24V. Is this a 24V system? Details, please.

Bill
05-23-2012 05:42 PM
sstuller
Re: Echo Charger with standby battery bank

I'm using a Steca controller that has a float stage. One of the questions I have about the Echo is the statement that it will provide 15 amps to the auxiliary battery bank if the voltage differential is 1.5 volts between the banks. Since the solar panel doesn't come close to that output, is the Echo output limited to the solar panel's output? Thanks.
05-23-2012 08:18 AM
Maine Sail
Re: Echo Charger with standby battery bank

Quote:
Originally Posted by btrayfors View Post
Well, yes and no. So long as the EchoCharge is sensing more than 13.0V on the main bank, including a "float level" of 13.2V or more, it will continue to pass some current to the auxiliary bank.

So, the answer to the OP's question is, YES, it will maintain the standby battery just fine.

Bill
A battery bank not receiving a charge will easily drop below the Echo turn on of 13.0V and the Echo will then shut off. 13.0V is a surface charge only and a full battery is about .3V below that.. If the battery was not full when the other bank stopped charging the bank fed by the Echo may not get full..

If the other bank is getting no charging it won't hang out above 13 volts very long especially with the Echo lightly loading it... It might stay above 13V for an hour or so, depending upon temp and how much the Echo is trying to pull, but that's about it..

I suspect Steve might do well to invest in a good controller that goes into float rather than shutting off completely.. If we knew what controller he has and the size of the array we could be of better assistance..
05-23-2012 07:43 AM
btrayfors
Re: Echo Charger with standby battery bank

Quote:
Originally Posted by Maine Sail View Post
If your other bank is no longer receiving a charge the Echo will also shut down..
Well, yes and no. So long as the EchoCharge is sensing more than 13.0V on the main bank, including a "float level" of 13.2V or more, it will continue to pass some current to the auxiliary bank.

So, the answer to the OP's question is, YES, it will maintain the standby battery just fine.

Bill
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