Av8rRob
Well Known Member
So as Ive be looking at others panels and electrical architecture I’ve noticed many builders with IFR panels are utilizing a TCW IBBS backup battery. I assume these are used for a combination of brownout prevention for the PFD/engine data/AHARS and backup power for the same items. All good. However TCW makes two models of 12v a 3 amp/hr and a 6 amp/hr priced at $230\$395 respectively. These must be located aft of the firewall and replaced (i believe i read every 4-5 years). Also they weight 18 ounces (not clear if the 6amp/hr is the same as the 3?).
Heres my question, why wouldn’t a builder just have two Earthx etx 680’s instead? The earthx is $379 but provides 12.4 amp/hrs. It does weight 2.75 more lbs but will allow starting off of an additional power source. It can be incorporated into a single alt / dual battery design like the z-19 or with a backup alt into a dual alt/ dual batt z-14. Also, it can be mounted on the firewall with the primary battery.
Thoughts?
Heres my question, why wouldn’t a builder just have two Earthx etx 680’s instead? The earthx is $379 but provides 12.4 amp/hrs. It does weight 2.75 more lbs but will allow starting off of an additional power source. It can be incorporated into a single alt / dual battery design like the z-19 or with a backup alt into a dual alt/ dual batt z-14. Also, it can be mounted on the firewall with the primary battery.
Thoughts?