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Using One Charger For Two Different Battery Types, on Jul 05, 2018 asked:

I hate asking you questions as I'm not even a customer, but if you move to Monterey CA I promise to give you business. That said, I watched all of your basic electrical videos and spent at least an hour researching this before I wrote this email. I'm going to get 2 Firefly Oasis AGMs for my house bank and use my current AGM for a starter battery. If I get a solenoid switch to charge the batteries from the alternator, I won't sleep at night knowing that the starter battery isn't getting the correct 3 stage charge (assuming a 3 stage regulator is installed) as I will set the voltage sensing wire to house bank. Maybe I misunderstood Nigel Calder, but I think that's what he recommends. Now, he talks about the Stirling Power Alternator to the battery charger and I'm leaning in this direction. My question, is this just over the top? Will the starter battery not be significantly harmed by bulk charging if it's in parallel to the house bank by solenoid? Is there another Blueseas product I am overlooking? This seems like such a common configuration, I can't imagine I'm the only one struggling with this. Another solution I came up with, I'm not sure is safe or effective, can I run the alternator to a distribution block, then to two independent 3 stage regulators for each bank? -Steve

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Upgrading from Flooded to AGM Batteries – What Setting Do I Change Including My Solar Controller?, on Jul 04, 2017 asked:

Last year I installed a Gioco 130W solar panel with a Genasun GV-10 Pb controller to charge my older flooded lead acid batteries along with a Victron BMV-700 Series battery monitor. I have just purchased brand new AGM batteries and I am wondering what steps I have to take before replacing the old batteries? - Heidi

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Switching to AGM Batteries, on Apr 04, 2017 asked:

My boat came with two starting batteries and I want to switch to AGM, what should I look out for? I have two 24M-800(CCA) 1000 CA starting batteries that came with the boat when I purchased it new. I don't leave them in the boat over winter from early November to early March. They are stored on my work shop wood bench in a heated garage over winter and are charged approximately every six weeks. They will not hold a charge for any period of time. I am thinking of changing them out with AGM batteries. A #27 series and a #31 series batteries. Can AGM batteries be used for both starting and house applications? All the research I have done on AGM's state they are good for both applications. Also , why would ether the manufacturer or the dealer put two starting batteries in the boat? Thanks in advance I look forward to your reply. - Lyn

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Replacing My Old Batteries, on Jan 31, 2017 asked:

My house batteries on my 42 foot Nordic Tug are in need of replacement. I have 6 golf cart interstate batteries with 600 amp hours. I believe I have 3 choices: 1. Replace with the same flooded, lead acid batteries – around $1000 or less – least expensive but require maintenance and last up to 5 years 2. Replace with AGM 3. Replace with Firefly Carbon Foam Can you review what I have and how they are currently connected and then recommend my options with cabling for the new style AGM or Firefly. Can you provide Canadian pricing for the options? - Bert

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Mixing Battery Types – George, on Jun 12, 2015 asked:

Hi Jeff, you upgraded my electronics on board my Hunter 50 cc. Now three years later I am in Asia, along the Thailand Malay border. My question is I have all AGM batteries on board with smart battery management on board. My starter battery is not holding charge and I need to replace it. They have no AGM batteries here in Langkawi. How serious is it if I get a non-AGM starter battery and what can go wrong? There is an ACR between house and start.

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Firefly Oasis vs. AGM vs. Flooded - Increasing Effective Bank Capacity – David, on May 26, 2015 asked:

I have a 35’ cutter boat that needs to have its house batteries replaced next year. I spoke with Nigel Calder and he recommended the Firefly Oasis batters. My existing house batteries have a capacity of about 200 Ahr. They are conventional lead acid, 6V golf cart batteries which are around 10 years old. What should I budget to replace the effective bank capacity if I want to increase capacity? On the last cruise our daily Ah draw was around 50Ah, no refrigeration etc. Ocean passages of 5 to 28 days, at anchor weeks at a time. For the most part, with our 400W solar panels, I would run the engine or generator once every 5 or 6 days at most. Most of the loads are lights (now LED), navigation equipment, auto helm, and radio equipment (HF, VHF, Radar, AIS). The HF is probably the biggest amp draw, and the time used can be significant.

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Ernest – AGM Battery Useable Range, on May 13, 2014 asked:

Hi Jeff, a quick question regarding the batteries you installed earlier this year. I believe you said the usable range was between 35% and 85% charged or roughly -110Ahr and -500Ahr for the 780Ahr batteries I have. Is this correct?

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Jeff – Lithium Ion Batteries, on May 01, 2014 asked:

I enjoyed your lithium ion battery technology article in Pacific Yachting Magazine. You left out one key fact - how much do they cost compared to wets or AGMs?

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Terry – Charging AGM and Flooded Batteries, on Dec 17, 2013 asked:

One of the 3 house banks I want it to charge is an AGM battery, but the charger only takes one setting for all three banks, the other 2 being flooded acid. Their web site FAQ says that AGM batteries can be charged using the flooded setting, is that correct or advisable? Yet the AGM setting is a lower indicated charging voltage - 14.4 volts compared to 14.8 volts. How can I safely charge both types at same time?

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Derek, on Aug 16, 2013 asked:

Hi Jeff, I attended one of your electronics seminars at the Vancouver boat show this spring and I was hoping you could help me with selecting a charger for my boat. I just purchased a 24’ Skagit Orca and I would like to replace the current battery charger. The previous owner said the charger on the boat boiled the previous batteries so he replaced the batteries and hasn’t used the charger since. I was wondering if you could recommend a suitable charger for my boat? The current charger is a 1996 procharger 2610. I have two 12v lead/acid batteries and the current charger is set up for shore power. I trailer my boat so I will plug it into my shop to charge the batteries before I make the next trip. I usually get out once or twice a month and I may overnight for a few days. In the future I might upgrade to AGM batteries.

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